Fiery Dust
Act III Quests
Find a way to destroy the Undying blockage in the Warehouse Sewers.
Starts when you first met Undying blockage in the Warehouse Sewers.
Then you need to go to Solaris Temple lvl 3 and speak with NPC.
After that go to Docks and find special item.
Bring it to NPC in Solaris Temple.
Go to Warehouse Sewers and burn Undying blockage.